Peristereoscopic photographic apparatus



May 23, 1950 M. BONNET 2,508,487

PERISTEREOSCOPIC PHOTOGRAPHIC APPARATUS Filed Oct. 25, 1945 5Sheets-Sheet 1 [n we )2 (for MA unme- BONNET Allan: eys

May 23, 1950 M. BONNET PERISTEREOSCOPIC PHOTOGRAPHIC APPARATUS 3Sheets-Sheet 2 Filed 001:. 25, 1945 amar/mgr y 1950 M. BONNET 2,508,487

PERISTEREOSCOPIC PHOTOGRAPHIC APPARATUS Filed Oct. 25, 1945 5Sheets-Sheet 3 Patented May 23, 1950 PERTSTEREOSCOPI APP c PHOTOGRAPHIGARATUS Maurice Bonnet-,. Paris, France, as'si'gnor to-' M: Reliephographie Soejete: pour LExploitati'om qestl roeedes de Bhotoira tphieenRelief-Maurice Bonnet", Paris, Francei a corporation of Franc' The"present invention refate's to pe'ii-stereoscopibphotographic apparatus:more"particular- I'yintended forprofessionaf studios; i'nwhich thecamera, or photbgraphic chamh'er'foilbws a path in an arc of acircle'ahoutthe'point' at which the subject is located, theneghtivecarri'enof the camera" and" therewith theme'g'atiiie; having a relativemovement of rotation about a" vertical median axis reliattiv'eli, to thechimera" during* the displtcementofthelittteri Accordingtotheinvent'ibhfthe apparatus" comprises a table, which isiprbvfdd notonly with tracks intended 'for rol'ir's" with" horizontal axessupportihgthe camera; buiflalsofw'ith an inner" tracliand-"an outertrackiii the torm of-c'oncen-' tric arcs of"cir'c1es Having-"their centre atthe sighting point ofth'ewamerajwhich effect the guiding of-the camera:and'*'st=-third guiding track orinclin'e; also-111'- thefiirni of an arcof a circle but having a radiirs and a: centre different from: those ofthe't'wo tracks-first m'entioned; this third tracli-beingfor the purposeof g-uiding "the nega' tit e-carrier. I

The photographic mctnres' ob'ttin'ed with the apparatus' accordingatotheinventicm' are*p'eristereoscopic picttlresgi if e3 compositepiotures"ob-' taihed and viewed through ai'selecting screen knownper'se. H g VThe invention essentielly relat'es to means ior guiding th'e camera orphotogrephic chamber and" the negatiVe-carrier--- of the said apparatus;in order to control the relative-movement"thereof;

In the accompanying drawings:

' Figure 1' shows=th--geometflcal construction onwhich the:guidingmechanism-according to the invention isbased? Figure 2 sh'0ws the'adaptatlon of'the theoretical construction according to' Figure *l 't'oap-practi'c'al embodiment;

Figure 3 a plan -viewoftheguiding mechanismy Figure:4:shows anaxia1section thereof; i and Figure 5 V shows a diagrammatic perspectivevlew of"theacomprete wmerhz- It fislto bemoted that these": drawingsconsti tute ime'relyr a l-diagrammatic:illustration" or "the invention;xandi'thet wheyhave ib'een traced without'an'y considerationioiscale,in'order'to i'acili tate the reading thereotiz lnFigurehl, 0 am!Wdesignate the centres of two circular; arcspAB andiAlB Itisrknownthatifza. straightline' P#-P1,one?of the 'pointssP' of whichelies%0n:-the:arc."ABpwhile: anotherfpoint P lies some the are: A Blizis" displaced Ialong these equ'afto that"separirihfihetwdaeiitreh oaha o the straightlineP -l? will n1ways reniainpere1- 1e'1 to itself; Infect} theppojsitesiae's" of the displacing thepoin't P1 "the' are A B the 1orny'bythfefrhct' tf nt'r'eliative pro- A B and ab are interruptetfattheline'm-y of Flgure 1 so as'toevoid the "ci'bsingiofth e arcs ofcircle AB' andab'.

This constructional maximisation enables the construction ofthe"firetic;1' mbodihient die-- grammatically"illiis'ti'ate n Iaih'niguies andsolves the problem o'fefie ng the -gniding of aphotographic chmfib a1 7 an" arc" of" circle of given radius; wfiil ettii s'a e time rotating a negative-carrierre ti y around'ave'rtioal meian it The negative carrier lo contexts. the' ph'otodirected parallel toThe operation of;

the photographic chmbenbropen'. in Y an intermediate position, .and 'in'dottetflines the wholeunit in the extreme posit In' the intermediate ofthe=subject as seen hyfich objetive *in the ineuing on' tracks 2 and wmfk thejoptiq arcs athe distance ibetweenlpointsl end l being ,lqi o 'thechamber aimed atfiioint fl,

chcumr are ab;

is m mamateaqm the si'd cheniber sensith e plate I 6 ant1thelentichlrselector=net- Work H; the cylindrical" demerits-or "which are plained"with phrticular 'r'efeteneeto Fi gn're 3,- which sh'ows' in full "thecontrol mechanism according to" the'inventionjlin" dot an "dash linesposit'fon'the-carrier I0 is at right angles. to 'theoptieaiexit @941;and the light raysissuingJroIn-fihe ohjectives are thereforeincidentupon th'e 'network- H at a: glvenengle. I Hencefia line imageisrecorded be-" hind each element "=0! the netwbrkf- The "aggi'e' gationof all the nine imag recorded"- behind all the elementsofthe'ntworliborresponds'to"a view termedia-te pbsition bf thechttmber'? If the unit"- comprisin'gzthephotogfaiihie chamber 1 and thepair of trays -5'-ai1d" i isl -displaced foneiittmple and 3 are soconstructed as to be concentric at this point.

At the sametime roller l2 travels on track 4 to cause the rotation ofpivot 9 and consequently of the carrier l mounted thereon. Hence, the

light rays issuing from objective l8 strike the network I! at anincreasing angle as the apparatus ner as previously described, theaggregation of all the line images corresponding to a new position ofthe apparatus along its line of travel gives rise to a new and differentangular view of the subject.

When the apparatus has travelled the whole course, the total surface 01.the photo-sensitive medium has been progressively impressed behind eachelement of thelnetwork due to the scanning effect.

I The negative obtained in this manner is removed from carrier Ill thendeveloped and thereafter used for printing positives, which give arelief view of the object situated at point 0 when they are viewedthrough a lenticular selecting network identical with network ll.

In Figures3 and 4 the device by means of which the roller I2 is pressedon the. incline 4 have not been illustrated, nor those which ensure theapplication without play of the rollers 8 to the tracks 2 and 3. Similarmeans are also used for ensuring the application, on their respectivetracks, oi rollers with horizontal spindles, which roll on the upper andlower faces of the table I. Any vibration of the apparatus during itsoperation is thus eliminated.

As the constant parallelism of the negative- =carrier relatively toitself, in the successive posi tions it occupies during the, movementeffected by the chamber along an arc of a circle, constitutes the mostgeneral case, since it satisfies the conditions for obtaining directperi-stereoscopic pictures, the foregoing description has been given onthis basis. However, any other law of rotation about its vertical pivotcan if required be imposed on the negative-carrier ID, by reversing theposition of the lever H, which carries the roller [2, relatively to theaxes 0-0, by modifying the length thereof, or by interposingspeedreducing or speed-raising .gearing between the roller l2 and thepivot 9 of the negative-carrier.

'In the device that has just been described, the position of the pivot 9in the plate 6 is unchangeable, and the focussing oi the image canthere- :fore be effected only by displacing the front body 13 of thecamera. In order to enable the size .of the picture to be changed,according to the invention use can be made of any supplementary devicehaving telescopic arms, or forks sliding on guiding rods, for effectinga variation of the length of both the longer sides of the parallelogramwhen the whole of the rear body of the chamber is moved, and bringingthe points 9 and i2 to 9', l2 for instance. The negative-carrier thenassumes the position Hl' indicated in Figure 4, and nothing is modifiedthereby in the operation of the device. Figure 5 which is a perspectiveview in diagram form of a slight modification of the apparatus ofFigures 3 and 4 shows the principal importance of the device. Thisfigure is intended to indicate more particularly how the rear portion ofthe apparatus and more particularly the negative carrier l0 may be movedforward or backward along the optical axis for focusing purposes, at thesame time as pivot 9'. The mechanism for carrying out this movementcomprises essentially sleeves l9 sliding on the rods 29 of a parallellinkage system similar to that which has already been described.

Whereas the table I has been shown as being 7 in one piece, it may ofcourse be designed in several sections suitably connected, whenapparatus of large dimensions having a large base is contemplated.

In order to extend the possibilities of utilisation of the apparatus, itmay also be equipped with one or more sets of inclines, superposed orjuxtaposed so as to enable the camera to be displaced along paths inarcs of circles of different radii, by transporting the movable unit sothat the rollers 8 and [2 roll on the inclines of one and the same set.

A complete peri-stereoscopic photographic camera such as shown in Figure5 comprises of course numerous auxiliary devices, the construction ofwhich may vary according to circumstances, and which need not bedescribed in detail here. All apparatus having the general differentialguiding features described and illustrated remain included in the scopeof the present invention.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat I claim is:

1. In a peri-stereoscopic photographic apparatus, wherein the camera orphotographic chamber is movable along a path in an arc of a circle abouta point at which the subject is located, the negative-carrier of thecamera having a movement of rotation about a vertical median.

axis, relatively to the camera, during the displacement of the latter, atable comprising horizontal tracks intended for rollers with horizontalaxes supporting the camera, an inner vertical track and an outervertical track, in the form of concentric arcs of circles having theircentre at the sighting point of the, camera, said concentric tracksbeing intended for rollers with vertical axes effecting the guiding ofsaid camera, and a third guiding track, also in the form of an arc of acircle, but having a radius and a. centre different from those of saidconcentric tracks, said eccentric track being intended to guide thenegative-carrier, in its rotating movement. 7

2. In a peri-stereoscopic photographic apparatus, wherein the camera orphotographic chamber is movable along a path in an arc of a circle abouta point at which the subject is located, the negative-carrier of thecamera having a movement of rotation about a vertical median spindle,relatively to the camera, during the displacement of the latter, a tablecomprising horizontal tracks intended for rollers with horizontal axessupporting the camera, an inner vertical track and an outer verticaltrack in the form of concentric arcs of circles, having their centre atthe sighting point of the camera, said concentric tracks being intendedfor rollers with vertical axes effecting the guiding of said camera, anda third guiding track, also in the form of an arc of a circle, buthaving a radius and a centre different from those of said concentrictracks, said eccentric track being intended to guide thenegative-carrier in its rotating movement, the vertical median spindleof the negative-carrier having secured thereto,

an arm carrying a guiding roller coacting with said eccentric track, thelength of said arm being equal to the distance between the centre ofsaid concentric tracks and the centre of said eccentric track.

3. In a peri-stereoscopic photographic apparatus, wherein the camera orphotograhpic chamber is movable along a path in an arc of a circle abouta point at which the subject is located, the negative-carrier of thecamera having a movement of rotation about a vertical median spindle,relatively to the camera, during the displacement of the latter, a tablecomprising horizontal tracks intended for rollers with horizontal axessupporting the camera, an inner vertical track and an outer verticaltrack in the form of concentric arcs of circles having their centre atthe sighting point of the camera, said concentric tracks being intendedfor rollers with vertical axes effecting the guiding of said camera, anda third guiding track also in the form of an arc of a circle, but havinga radius and a centre different from those of said concentric trackssaid eccentric track being intended to guide the negative-carrier in itsrota-ting movement, the vertical median spindle of the negative carrierhaving secured thereto an arm carrying a guiding roller, coacting withsaid eccentric track, the length of said arm being equal to the distancebetween the centre of said concentric tracks and the centre of saideccentric track, said guiding roller having a radius equal to thedifference between the radius of the outer concentric track and theradius of the eccentric track.

4. In a peri-stereoscopic photographic apparatus wherein the camera orphotographic chamber is movable along a path in an arc of a circle abouta point at which the subject is located, the negative-carrier of thecamera having a movement of rotation about a vertical median axis,relatively to the camera, during the displacement of the latter, a tablecomprising horizontal tracks intended for rollers with horizontal axessupporting the camera, an inner vertical track, and an outer verticaltrack, in the form of concentric arcs of circles having their centre atthe sighting point of the camera, said eccentric tracks being intendedfor rollers with vertical axes, eiTecting the guiding of said camera,and a third guiding track also in the form of an arc of a circle, buthaving a radius and a centre different from those of said concentrictracks, said eccentric tracks being intended to guide thenegative-carrier in its rotating movement, two rods parallel to thesighting axis of said camera in a horizontal plane, a horizontal beamadjustable along said rods and hinged thereto, a vertical spindle rigidwith said beam coaxial with the median axis of the negative carrier andfixed thereto, a second beam parallel to the said first beam and hingedto said rods and a vertical spindle rigid with said second beam havingan arm secured thereto carrying a guiding roller coacting with saideccentric track, the length of said arm being equal to the distancebetween the centre of said concentric tracks and the centre of saideccentric tracks.

MAURICE BONNET.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 933,801 Verbeck Sept. 14, 19091,232,993 Tanquary et a1 July 10, 1917 1,312,675 Beyer Aug. 12, 19191,347,062 Stromberg July 20, 1920 2,150,932 McDonnell Mar. 21, 19392,158,660 Kanolt May 16, 1939 2,386,276 Simjian Oct. 9, 1945 FOREIGNPATENTS Number Country Date 181,633 Germany Mar. 2, 1907 590,853 FranceMar. 26, 1925

